Hess AF (September 1924). "On the Induction of Antirachitic Properties in Rations by Exposure to Light". Science. 60 (1551): 269. doi:10.1126/science.60.1551.269. PMID17791245.
Hess AF (September 1924). "On the Induction of Antirachitic Properties in Rations by Exposure to Light". Science. 60 (1551): 269. doi:10.1126/science.60.1551.269. PMID17791245.